Grease masking packaging materials and methods thereof

ABSTRACT

The present invention relates generally to the packaging materials. More specifically, the invention relates to materials and methods suitable for use as packaging materials whereby the appearance of grease, fat or oil staining on the packaging material is reduced or eliminated.

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to U.S. Provisional ApplicationNo. 60/298,868, filed Jun. 15, 2001. This application also claimspriority to U.S. Provisional Application No. 60/258,686, filed Dec. 28,2000. The disclosures of each of these applications are incorporatedherein by reference in their entireties.

FIELD OF THE INVENTION

[0002] The present invention relates generally to packaging materials.More specifically, the invention relates to materials suitable for useas packaging materials, whereby the appearance of grease, fat or oilstaining on the packaging material is reduced or eliminated.

BACKGROUND OF THE INVENTION

[0003] Packaging materials, such as paperboard, paper or fabric arefrequently utilized to package grease, fat or oil-containing materials.For example, human and animal foodstuffs commonly include a significantamount of grease, fat or oil. During filling, transport or storage, thegrease, fat or oil from the foodstuff can migrate from the food productto the packaging material, thereby resulting in unsightly stains on theouter surface of the packaging material. Also, grease, fat oroil-containing materials may come into contact with the outer surface ofthe packaging material to cause staining. While this migration ofgrease, fat or oil does not normally effect the structural integrity ofthe packaging material, the consumer generally dislikes the stainedcontainer and may be less likely to purchase a product because of suchstaining.

[0004] One solution to the problem of grease, fat or oil staining on apackaging material is to place the material to be packaged within anseparate impermeable container within the packaging material itself suchas, for example, a plastic bag. While such a method normally preventsgrease, fat or oil staining in the packaging material prior to use bythe consumer of the packaged material, this method has lesseffectiveness when the package has been opened and returned to theconsumer's shelf for storage. For example, grease, fat or oil-containingcrackers may be placed in a plastic bag within a packaging material.Grease, fat or oil will be contained within the bag as long as the bagremains closed. However, once opened, it is quite common for a consumerto drop one or more crackers between the bag and the inner surface ofthe packaging material when removing the crackers for use. If there isno barrier material between the outer surface of the plastic bag, it islikely that grease, fat or oil will migrate from the cracker into andthrough the packaging material, thereby resulting in an unsightly stainon the outer surface of the packaging material. Stains on packagingmaterial may also be caused by filling line debris or puncturing of theplastic bag.

[0005] Stains on the packaging material may also be caused by contact bya grease, fat or oil-containing material with the outer surface of thepackaging material. Such stains may be from contact of the package witha grease, fat or oil stain on another package or by contact with grease,fat or oil-containing substances that may occur during filling,transport or storage.

[0006] Furthermore, it will be understood that, irrespective of theorigin of a grease, fat or oil stain, extended times and elevatedtemperatures will normally exacerbate the appearance of such stains.

[0007] Whether or not a plastic bag is placed within the packagingmaterial, in the past, it has been common to treat the packagingmaterial with a barrier material effective to reduce the possibilitythat grease, fat or oil will migrate into and through the packagingmaterial to cause a visible stain on the outer surface of the packagingmaterial. The most common barrier materials from the standpoint of costand effectiveness have been those of the fluorochemical variety i.e.,Scotchguard® products, made by the 3M Company of Minneapolis, MN. Thesematerials have generally been applied to the packaging material prior toformation into, for example, a box. However, due to environmental andhealth concerns, 3M's fluorochemical barrier products have recently beenremoved entirely from the market. While other barrier materials exist,many otherwise effective methods are either not acceptable as the solemethod of protection for use in certain applications or are applied fromsolvent-based systems. Moreover, for some of the more useful methods,the methods may be prohibitively expensive and/or not effective enoughfor many applications. Thus, the removal of 3M's fluorochemical barrierproducts from use has left a major void in the packaging materialsmarket.

[0008] U.S. Pat. No. 4,521,492 discloses a method of masking theappearance of grease, fat or oil staining on a paperboard packagingsubstrate by first applying a non-leafing metallic ink over thesubstrate, followed by the application of a highly pigmented white outerlayer. It is stated that the presence of the metallic ink alters therefractive index of the grease, fat or oil stained substrate and theover-coating with the highly pigmented white outer layer reduces oreliminates the metallic appearance of the lower ink layer. Whileeffective for the masking of grease, fat or oil permeation, this methodhas at least two significant disadvantages. First, this materialrequires application of at least the non-leafing metallic ink layerusing explosion-proof equipment because the non-leafing metallic ink isdelivered from a solvent-based system. Second, the method requires theuse of solvent recovery systems. These greatly increase the cost ofutilizing this prior art grease masking system because the method cannotbe used with existing mill equipment without resulting in difficulties.Further, the method of U.S. Pat. No. 4,521,492 has limited applicationsto printing press methods which reduces the usefulness of the process inprinting processes requiring a multiple of print stations.

[0009] Against the above, it would be highly desirable to develop amethod whereby the appearance of grease, fat or oil staining on apackaging material could be masked so that even if grease, fat or oilstaining does occur, such stains will be less noticeable. Specifically,it would be desirable to be able to mask the appearance of grease, fator oil staining on a packaging material whereby the materials utilizeddo not comprise non-leafing metallic inks. Further, it would bedesirable to apply such masking methods by way of aqueous systems,thereby allowing the use of standard mill equipment.

SUMMARY OF THE INVENTION

[0010] In accordance with the purpose(s) of this invention, as embodiedand broadly described herein, this invention, in one aspect, relates toa packaging material comprising a substrate suitable for use as apackaging material wherein the appearance of grease, fat or oil on thesubstrate is masked by the selection of the color and, optionally,composition of one or more colored layers proximally disposed on anouter surface of the substrate, wherein the substrate may itself becolored. In a further aspect, methods of making and using the previouslydescribed packaging materials are provided.

[0011] Additional advantages of the invention will be set forth in partin the description which follows, and in part will be obvious from thedescription, or may be learned by practice of the invention. Theadvantages of the invention will be realized and attained by means ofthe elements and combinations particularly pointed out in the appendedclaims. It is to be understood that both the foregoing generaldescription and the following detailed description are exemplary andexplanatory only and are not restrictive of the invention, as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012]FIG. 1 is an illustration of a coated substrate with a darkcolored layer and light colored layer disposed proximally thereto.

[0013]FIG. 2 is an illustration of a substrate in which the outersurface is dark colored and the substrate has a light colored layerdisposed proximally thereto.

[0014]FIG. 3 is an illustration of a substrate with a precoat layeradjacent thereto and with a dark colored and light colored layerdisposed proximally to the precoat treated substrate.

DETAILED DESCRIPTION OF THE INVENTION

[0015] Before the present compounds, compositions, articles, devices,and/or methods are disclosed and described, it is to be understood thatthis invention is not limited to specific methods of making or applyingthe masking compositions herein, or specific compositions thereof, and,as such, may, of course, vary. It is also to be understood that theterminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting.

[0016] It must be noted that, as used in the specification and theappended claims, the singular forms “a,” “an” and “the” include pluralreferents unless the context clearly dictates otherwise. Thus, forexample, reference to “a colorant” includes mixtures of colorants.

[0017] Ranges may be expressed herein as from “about” one particularvalue, and/or to “about” another particular value. When such a range isexpressed, another embodiment includes from the one particular valueand/or to the other particular value. Similarly, when values areexpressed as approximations, by use of the antecedent “about,” it willbe understood that the particular value forms another embodiment. Itwill be further understood that the endpoints of each of the ranges aresignificant both in relation to the other endpoint, and independently ofthe other endpoint.

[0018] In this specification and in the claims that follow, referencewill be made to a number of terms which shall be defined to have thefollowing meanings:

[0019] “Colorant” means any substance that imparts color to anothersubstance or mixture. As meant herein, white and black are colors. Thisdefinition of colorant also includes, but is not limited to pigments,dyes, whiting, barytes, clays and talc.

[0020] “Substrate color” means the color of the substrate e.g.,paperboard, paper or fabric or other material without any added colorantand prior to the addition of the dark colored layer or the light coloredlayer. When a colorant is directly added to one or more plys of thesubstrate as described hereinbelow, the substrate color will bedifferent from uncolored paperboard. For example, when recycledpaperboard is the substrate, the substrate color will generally be lightbrown prior to the addition, if any, of colorant to one or more plys ofthe paperboard.

[0021] “Light colored” as utilized to describe either a layer or acolorant means having a value of from about 50 to about 95 on the Cielabscale. In further separate aspects, the light colored layer may be fromabout 55 to about 95 or from about 60 to about 95, or from about 65 toabout 95, or from about 75 to about 95, or from about 80 to about 95,all such values being measured on the Cielab scale.

[0022] “Dark colored” as utilized to describe either a layer or acolorant means having a value of from about 0 to about 75 on the Cielabscale. In further separate aspects, the dark colored layer may be fromabout 0 to about 65, or from about 0 to about 55, or from about 0 toabout 45, or from about 0 to about 40, or from about 0 to about 35, orfrom about 0 to about 30, or from about 0 to about 25, or from about 0to about 20, or from about 0 to about 15, such values being measured onthe Cielab scale.

[0023] As utilized herein, “dark colored” is defined in reference to acorresponding “light colored layer” and vice versa. That is, a darkcolored layer (or substrate) is always darker in color that the lightcolored layer that will be applied over the dark colored layer (orsubstrate) when these two colored aspects combine to form the maskingaspect of the present invention. In one or more aspects, it is possiblethat a dark colored layer (or substrate) utilized with one substrate maybe lighter in color than the light colored layer utilized on a differentsubstrate.

[0024] “Aqueous” means that the system comprises about 92% by weight orabove of water. Such systems are considered to be essentially solventfree.

[0025] “Proximal” means that the referenced aspect or object is near tobut not necessarily touching the aspect or object to which the word“proximal” refers. “Adjacent to” means the aspect or object is touchingthe aspect or object to which the phrase “adjacent to” refers.

[0026] References in the specification and concluding claims to parts byweight of a particular element or component in a composition or article,denotes the weight relationship between the element or component and anyother elements or components in the composition or article for which apart by weight is expressed. Thus, in a compound containing 2 parts byweight of component X and 5 parts by weight component Y, X and Y arepresent at a weight ratio of 2:5, and are present in such ratioregardless of whether additional components are contained in thecompound. However, compositions such as those disclosed and claimedherein may also be described by one of ordinary skill in the art ascontaining “parts” of a component. For example, a composition containing100 parts pigment and 22 parts binder would comprise 82% pigment(100/100+22) and 18% binder (22/22+100). Such nomenclature is not usedto describe and claim the invention herein.

[0027] A weight percent of a component, unless specifically stated tothe contrary, is based on the total dry weight percent of theformulation or composition in which the component is included.

[0028] As utilized herein, “packaging material” means a material thatmay be used to make an article suitable for performing one or more ofthe following functions: a) containment for handling, transportation anduse; b) preservation and protection of the contents for required shelfand use life and sometimes protection of the external environment fromany hazards of contact with the contents; c) identification of contents,quantity, quality and manufacturer; and d) facilitation of dispensingand use. Non-limiting examples of the packaging material article includea wrap, pouch, bag, box, cup, tray, plate, can, tube, bottle or othercontainer form.

[0029] By the term “effective amount” of a compound or property asprovided herein it is meant such amount as is capable of performing thefunction of the compound or property for which an effective amount isexpressed. As will be pointed out below, the exact amount required willvary from process to process, depending on recognized variables such asthe compounds employed and the processing conditions observed. Thus, itis not possible to specify an exact “effective amount.” However, anappropriate effective amount may be determined by one of ordinary skillin the art using only routine experimentation.

[0030] Referring first to the drawings, FIG. 1 is an illustration of oneaspect of the present invention. A substrate 12 having an innersubstrate surface 14 and an outer substrate surface 16 is coated with adark colored layer 18 having an inner dark colored surface 20 and anouter dark colored surface 22 such that the dark colored layer isdisposed proximal to outer substrate surface 16. A light colored layer24 having an inner light colored surface 26 and an outer light coloredsurface 28 is disposed proximally to outer dark colored surface 22. Apackaged good 30 may be present and may or may not be in contact withthe inner substrate surface 14.

[0031]FIG. 2 illustrates a further aspect of the present inventionwherein the substrate 32 has an integrated dark colored portion 34having an inner dark colored surface 36 and an outer dark coloredsurface 38. The light colored layer 24 may then be disposed proximallyto the outer dark colored surface 38.

[0032]FIG. 3 illustrates a further aspect of the present inventionwherein the substrate 12 has a precoat layer 40 having an inner precoatsurface 42 and an outer precoat surface 44 disposed proximally to outersubstrate surface 16 and inner dark colored surface 20.

[0033] Now referring to a first major aspect of the present invention,the invention provides a material for packaging grease, fat oroil-containing substances, wherein the packaging material comprises: agrease, fat or oil permeable substrate suitable for use as a packagingmaterial, wherein the substrate has an inner and an outer surface; adark colored layer having an inner and outer surface disposed proximalto the outer surface of the substrate, wherein the dark colored layercomprises a dark colorant; and a light colored layer having an inner andan outer surface disposed proximal to an outer surface of the darkcolored layer, wherein the light colored layer comprises a lightcolorant; wherein the dark and light colored layers are selected to maskthe appearance of grease, fat or oil staining on the packaging material,and wherein neither the dark colored layer nor the light colored layercomprises a non-leafing metallic ink. By “non-leafing metallic ink,” itis meant the inks disclosed in U.S. Pat. No. 4,521,492, the disclosureof which is incorporated herein in its entirety by this reference. In astill further aspect, the colorants of the invention herein do notcomprise a metallic material. For example, the colorants of theinvention herein do not comprise an aluminum-containing colorant. Yetstill further, the colorants of the present invention consistessentially of a non-leafing metallic ink.

[0034] A grease, fat or oil-containing material can be packaged in thepackaging material. Upon storage, grease, fat or oil from the packagedmaterial may come in contact with the inner surface of the substratesuch that grease, fat or oil may migrate through the substrate to bevisible on an untreated outer surface of the substrate. Also, grease,fat or oil may come into contact with the outer surface of a packagingmaterial during filling or storage of the packaging material. It hasbeen discovered that with the present invention, the appearance of suchgrease stains may be reduced or eliminated. As meant herein, “reduced”or “eliminated” are terms that will be relative to the specificapplication. For example, in a particular aspect, grease, fat or oilstaining may be totally “eliminated” when the package has a useful lifeof only several weeks, whereas, grease, fat or oil staining may be“reduced” in the same treated substrate if the useful life of thepackage is several months. This is due to the fact that the presentinvention generally does not result in the formation of an impermeablebarrier on a packaging material. Rather, it is believed that through acombination of optical phenomena and formulation selection, thesurprising and unexpected masking properties of the present inventionare obtained.

[0035] In a further aspect, the dark colorant may comprise one or moreof: carbon black, raw sienna, burnt sienna, burnt umber, chrome black,high purity furnace black, black azo dyes or brown azo dyes. In a stillfurther aspect, the dark colorant comprises carbon black. While suchmasking many not be permanent in most circumstances, the duration andextent of masking is sufficient for packaging materials uses.

[0036] In a further aspect, the light colorant comprises one or more of:titanium dioxide, calcium carbonate, calcium silicate, calcium sulfate,barium sulfate, natural clay, a synthetic clay, magnesium oxide,magnesium silicate, zinc carbonate, zinc oxide and plastic pigment. Atitanium dioxide product particularly suitable for use in the inventionherein is Huntsman R-BC Slurry, a product of Huntsman Trioxide, SaltLake City, UT. Clays suitable for use in the invention herein include,but are not limited to, kaolin (grades 1, 2 etc.), delaminated clay andstructured clay. Kaolin clays particularly suited for the inventionherein include Kaoprint and Kaobrite, products of Thiele, Sandersville,Ga. In a further aspect, the colorant does not comprise calciumcarbonate. In a further aspect, the light colorant does not comprisecalcium carbonate.

[0037] In a further aspect, the dark colorant may be optionally appliedfrom a dark colorant-containing solution. It should be noted that thedark colorant-containing solution may normally contain additionalmaterials, including other colorants. These additional materials maycomprise materials such as titanium dioxide, which, in addition to beinga white colorant, may also act as an opacifier. Thus, when opacity isdesirable in the dark colored layer, titanium dioxide can be includedalong with the dark colorant. A further additional material in the darkcolored layer, as well as in the light colored layer, may comprise clayor calcium carbonate, which, in addition to being white colorants, mayalso act as extenders or opacifiers, whereby the amount of colorant tobe utilized in the solution may be reduced or eliminated. Thus, it iscontemplated according to the invention herein, that the darkcolorant-containing solution may also contain materials that arereferred to elsewhere herein or otherwise known as “light colorants” orthat are otherwise generally known to one of ordinary skill in the artas “colorants.” Thus, when utilized in conjunction with the darkcolorant herein, the purpose of these materials is for a reason otherthan for conferring color, however, some color may nonetheless beconferred by use of such materials.

[0038] In a significant aspect, the materials utilized in one or more ofthe dark or light colored layers or to color one or more plys of thesubstrate itself may be suitable for use in food, drug or cosmeticapplications. Such materials are specifically described in Title 21 ofthe United States Code. More particularly, the colorants that may besuitable for use in the invention herein are described in Title 21,Section 178.3297 of the United States Code. The disclosures of allreferenced United States Code sections are herein incorporated in theirentireties by this reference. Other materials, whether colorants orotherwise, may be suitable for use in food, drug and cosmeticapplications that are not specifically delineated in the United StatesCode, particularly materials that may be available outside of the U.S.and are suitable for use therein. As such, it is contemplated hereinthat materials not specifically set forth in the United States Code maybe utilized in the present invention.

[0039] One of ordinary skill in the art may further understand thatother non-food, drug or cosmetic approved colorants or other ingredientsmay be utilized in accordance with the invention herein according to theintended end-use for the packaging material, as long as such colorantsare not those utilized in non-leafing metallic inks. For example, if thematerial to be packaged is a grease, fat or oil-containing pesticide, itwill not be necessary for the materials utilized on the surface of thepackaging substrate to be acceptable for food, drug or cosmeticapplications. Further, even where the material to be packaged is food,drug or cosmetic material, a wide range of additional colorants may beutilized where such materials are acceptable for such applications.

[0040] In one aspect, the dark colored layer may be applied from a darkcolorant-containing solution, wherein the dark colorant-containingsolution comprises from about 0.01 to about 20.0% by weight of the darkcolorant as measured by total weight of the solution. Still further, thedark colorant-containing solution comprises from about 0.25 to about4.0% by weight of the dark colorant as measured by total weight of thesolution. Yet still further, the dark colorant may be present in thedark colorant-containing solution at from about 0.01, 0.1, 0.25, 0.5,1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5,8.0, 10.0, 12.0, 14.0, 16.0, 18.0 and 20.0% by weight of thedark-colorant-containing solution, where any of these stated amounts maycomprise either the upper or lower endpoint of the range of darkcolorant therein and any lower endpoint can be used with any upperendpoint.

[0041] In a further aspect, the light colored layer may be applied froma light colorant-containing solution, wherein the lightcolorant-containing solution comprises from about 30 to about 90% byweight of the light colorant as measured by total weight of thesolution. Still further, the light colored layer may be applied from alight colorant-containing solution, wherein the lightcolorant-containing solution comprises from about 40 to about 80% byweight of the light colorant as measured by total weight of thesolution. Yet still further, the light colorant may be present in thelight colorant-containing solution at from about 1, 5, 10, 25, 30, 35,40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 99% by weight of thelight colorant-containing solution, where any of these stated amountsmay comprise either the upper or lower endpoint of the range of lightcolorant therein and any lower value can be used with any upper value.

[0042] In a significant further aspect, either or both of the coloredlayers may be applied from respective light or dark colorant-containingsolutions, wherein either or both solutions may be aqueous. By havingaqueous systems as defined previously, standard paper mill equipment maybe readily utilized to prepare packaging materials according to theinvention herein. This provides significant advantages in the presentinvention over the methods disclosed in U.S. Pat. No. 4,521,492.

[0043] In one or more aspects of the present invention, the dark coloredlayer may not be separately applied to the substrate. If no dark coloredlayer is separately applied, the substrate itself may have a substratecolor that is darker than the light colored layer. In such an aspect,the substrate color is modified to be darker than the uncolored(natural) substrate. For example, a dark color can be added to one ormore layers (or plys) in a single or multi-ply paperboard by means of acolorant addition step during the paper manufacturing process so thatthe entire substrate (in a single ply product) or the outer surface ofthe paperboard (in a multi-ply product) is darker than that of uncoloredsubstrate. In one aspect, a multi-ply paperboard article may bemanufactured whereby the pulp comprising one or more outer plys, forexample, the top liner, is treated with a dark colorant to result in adark colored outer surface for the substrate. In separate aspects, thenumber of plys in the paperboard (whether colored or uncolored) is two,three, four, five, six, seven, eight, nine or ten, in which one or moreouter plys may be colored with a dark colorant according to the presentinvention. Such dyes or colorants may be present in a pulp slurry in arange of from about 0.1 to about 3.0% by weight. Such colorants may inthe form of azo dyes wherein the individual colors may be used alone ormixed with other azo dyes to form a dark color in one or more plys ofthe paperboard. In a further aspect, the entire paperboard product maybe dark colored by the addition of azo dyes to a pulp slurry in theamounts of from about 0.1 to about 3.0% by weight.

[0044] Methods of making paperboard products are not crucial to theinvention herein and are well known generally to one of ordinary skillin the art. Specific examples of methods that may be utilized herein aredescribed generally in U.S. Pat. Nos. 4,753,710, 4,913,773 and5,169,496, the disclosures of which are each incorporated herein intheir entireties by this reference.

[0045] As contemplated herein, the specific shade of dark colorant orlight colorant is not crucial to the invention. However, as noted, the“dark” colorant should provide a color to the substrate that is darkerthan that provided by the “light” colorant to the light colored layerand vice versa.

[0046] In one aspect, the light colored layer may be white and the darkcolored layer may be black or gray. In further aspects, the lightcolored layer may be yellow, pink, pale green, pale blue, etc.; that is,the light colored layer may be any color that exhibits a significantreflectance of light. The dark colored layer may be blue, purple, brown,etc.; that is, the dark colored layer may be any color that exhibits asignificant absorbance of light. Definitions of “light colored” and“dark colored” are as previously set forth herein.

[0047] While not wishing to be bound by theory, it is believed that byselecting an outer substrate color that is closer in color to that of agrease, fat or oil stain, the appearance of a grease, fat or oil stainon the outer surface of the packaging material will be lessened, reducedor eliminated. That is, it is hypothesized by normalizing the backgroundcolor of the packaging material to a shade similar to the grease, fat oroil, the refractive index of the packaging substrate may be altered sothat a grease, fat or oil stain may be less visible in the finishedpackaging material. Further, selection of the light colored layer willbe dependent on a number of factors including the degree of darkness ofthe dark colored layer and the desired whiteness/brightness of the outerlayer.

[0048] It should be noted that a very dark colored layer itself willlikely be effective to mask a wide variety of grease, fat or oil stainsor a substrate. However, one of ordinary skill in the art will recognizethat such a dark layer will be difficult to cover with a light-coloredover layer without having a very thick layer and/or having a largeamount of opacifying pigments, such as TiO₂. However, according to themethod and compositions of the present invention, it is possible to maskgrease, fat or oil staining by means of selection of the dark coloredand light color layers to provide cost effective packaging materials.

[0049] Accordingly, when a light colored layer is selected and appliedover the dark colored substrate or the dark colored layer, the maskingmay be effectuated by the application of the light colored outer layer.In accordance with the present invention, and in some aspects inconjunction with binder materials (as discussed in more detail below),it is believed that this optical phenomenon is augmented and enhanced ina surprising and unexpected manner.

[0050] In the selection of the colors so as to mask the appearance ofgrease, fat or oil permeation (e.g. staining) in a packaging material,the relative thickness of the colored layers, the concentration ofcolorants in the coatings, the type of grease, fat or oil-containingmaterial being packaged and the time and the temperature to which thepackage is subjected will each be relevant. For example, when the greasemasking capability of a packaging material need only be apparent for ashort time, such as with a fast food container in which the packagedmaterial may be consumed shortly after purchase, a dark color may notneed to be as dark and a light color may not need to be as lightrelative to each other because the grease masking necessity for thepackage is relatively short-lived. In contrast, when packaging a foodproduct where the storage capability needs to be longer, the dark colorand/or the light color may need to have a greater masking ability.Moreover, the degree of a grease, fat or oil stain will also be relatedto the type of material being stored in the packaging material. However,in accordance with the disclosure herein and the general knowledge inthe art, one of ordinary skill in the art will be able to determine therelative amounts of ingredients, thickness of coatings, etc. useful forparticular applications without undue experimentation.

[0051] In a still further aspect, the packaging material may have aTAPPI brightness number of from about 50, 55, 60, 65, 70, 75, 80, 85,90, 95, 99 or 100, where any of these referenced measurements maycomprise either the upper or lower endpoint and any of these lowerendpoints may be used with any of these higher endpoints. In a furtheraspect, the packaging material may have a TAPPI brightness number offrom about 60 to about 90. Still further, in another aspect, thepackaging material has a TAPPI brightness number of greater than 75. Thebrightness of the packaging materials are measured according to TAPPImethod T452 om-83. This TAPPI method is incorporated herein in itsentirety by this reference.

[0052] In a further major aspect, the grease, fat or oil permeablesubstrate utilized according to the compositions and methods hereincomprises paperboard, paper or fabric. However, one of ordinary skill inthe art will recognize that the substrates in which this invention maybe utilized are not limited to these specifically enumerated substrates.Rather, it is contemplated according to the invention herein “substrate”includes any article that customarily or feasibly could be coated with acoating formulation or that may itself be dark colored and may be coatedwith the light colored layers described herein. In separate aspects, thesubstrate must be suitable for use as a packaging material as the termis defined elsewhere herein.

[0053] Still further, in another aspect, the grease, fat or oilpermeable substrate may comprise paperboard. The paperboard so utilizedcan specifically comprise one or more of: SBS (“solid bleachedsulfate”), SUS (“solid unbleached sulfate”) or recycled paperboard.

[0054] SUS (for example, Omnicoat® or Pearlcoat®, Riverwood, Marietta,Ga.) utilized according to the methods herein may be comprised ofprimarily southern pine species such as the Loblolly as a fiber source,although some hardwood fiber may be used, particularly in one or moreouter plys. Some recovered paper may also be added as a fiber source,which may account for about 20% of the fiber (although this amount willvary based on market conditions and other factors). SUS is generally abrown-colored paperboard which can then be coated according to themethods herein with application of a dark colored layer proximal to theSUS and a light colored proximal to the dark colored layer.Additionally, one or more outer plys of the SUS may be colored to resultin a one or more dark colored outer plys on the paperboard.

[0055] When recycled paperboard (for example ClassicNews®, Rock-TennCompany, Norcross, Ga.) is utilized in the compositions and methodsherein, a variety of types of recovered paper and paperboard may beutilized. Each source may have an impact on the final substrate and,accordingly, the packaging applications to which the packaging materialis suited. Two of the predominant fibers utilized in recycled paperboardsources may be old newspapers (ONP) and old corrugated containers (OCC).ONP normally add bulk and can improve formation but may not convey asmuch strength as OCC. Another common fiber source may be office wastepaper (OWP) which has high value when utilized as an outer (top) ply toprovide a clean, smooth printing surface for the coated recycledpaperboard. This outer ply may be made dark colored according to themethods of the invention herein. Recycled clippings from printing andconverting plants also can provide a large fiber source for the recycledcoated paperboard industry.

[0056] SBS (for example, from Westvaco, Covington, Va.) that may beutilized according to the methods and compositions herein generallycomprises bleached fiber from both softwood and hardwood trees, althoughthere normally is a higher percentage of hardwood fiber therein. Thepercentage of hardwood fiber can vary significantly without affectingits use in the invention herein, but, typically, the hardwood contentmay be greater than about 80%. SBS utilized according to the methodsherein may also contain some recycled fibers. When matted intopaperboard according to known papermaking procedures, hardwood fibersgenerally form a smooth white sheet. As such, without treatment with thegrease masking method herein, the appearance of grease, fat or oilstaining on this SBS substrate will be marked. In a significant aspect,the packaging material prepared according to the invention herein may besuitable for use in packaging food, drugs or cosmetics. Moreparticularly, the packaging material may be suitable for use inpackaging human food or animal food.

[0057] In addition to paperboard as described above, the substrate maybe paper or fabric. If the substrate is paper or fabric or some othersuitable substrate, it will be understood that the substrate itself maybe dark colored or a separate dark colored outer layer may be applied toaccomplish the objectives of the present invention. When paper, thepackaging material may be in the form of a single layer or in amulti-ply bag. Application of the dark and light colored layers to bothpaper and fabric materials is in accordance to the methods disclosedherein with respect to paperboard. To the extent that the applicationmethods may differ, such differences will be minimal and one of ordinaryskill in the art will recognize the same.

[0058] In a further aspect, the colorant-containing solutions from whichone or more of the dark colored layers and the light colored layers areapplied each, independently, comprise one or more of: water, dispersant,resin, surfactant, wetting agent, defoamer, thickener, starch,preservative, or antioxidant. Such additional materials may be includedin the colorant-containing solutions according to methods knowngenerally to one of ordinary skill in the art. Non-exclusive examples ofcoating formulations that may be utilized in accordance with theinvention herein are disclosed generally in U.S. Pat. No. 5,837,383, thedisclosure of which is incorporated herein in its entirety by thisreference.

[0059] Furthermore, there may be a layer on the outer surface of thegrease, fat or oil-permeable substrate, wherein the layer comprises oneor more of: starch, polyvinyl alcohol, or one or more sizing agents thatwould be recognizable by one of ordinary skill in the art. When starchis utilized in the present invention, the starch may be catatonicallymodified to augment the affinity of the precoat to the substrate that,if comprised of paper or paperboard, may carry a net anionic charge.Still further, in another aspect, the layer may comprise a dye, pigmentor other type of colorant, and, as such, this layer may operate as thedark colored layer. This layer, whether colored or not, may or may notcomprise binder.

[0060] Still further, in another aspect, a printed layer may be presentadjacent to an outer surface of the light colored layer. Such methods ofprinting are well known to one of ordinary skill in the art and, assuch, are not described herein in detail.

[0061] With respect to the dark colored layer aspect of the invention,the following method may be utilized. After preparation and drying ofthe packaging substrate, a dark colorant containing solution, forexample, comprising starch, dark colored pigment and water can beapplied on a wet stack calendar (in addition to or instead ofapplications on a size press for Fourdrinier machines). The wet stackmay consist of a stack of rollers, which may be from five or sevenrollers high. The web may then be threaded through this stack. Waterboxes containing the percent solution may be placed adjacent to oneroller for the topside of the web and another roller for the bottom sideof the web. The dark colored layer can be applied to the web as the webpasses the water boxes.

[0062] In separate aspects, the dark colored layer may be adjacent tothe substrate and the light colored layer may be adjacent to the darkcolored. Still further, the dark colored layer may be proximal to thesubstrate and adjacent to the light colored layer. Still further, thedark colored layer may be proximal to the substrate and the lightcolored layer may be proximal to the dark colored layer.

[0063] In addition to the previously described layers, a barrier orfixing layer separate from the light and or dark colored layer may beadded at any location on the packaging material without detracting fromthe purposes of the present invention. For example, a clear barrier orfixing coat may be disposed between the outer surface of the substrateand the dark colored layer, between the dark colored layer and the lightcolored layer or may be disposed on the surface of the light coloredlayer before or after the application of a printed layer, if any.

[0064] As noted, binders may be useful in the light and/or darkcolorant-containing solutions herein and will be present in bindersolutions as binder solids as discussed below. Binders suitable for usein the first or light colored solutions herein may comprise naturally-or synthetically-derived materials.

[0065] In particular aspects, suitable synthetic binders may compriselatex polymers, wherein such latex polymers are derived from monomerscomprising one or more of: acetoacetoxy ethyl methacrylate, acetoacetoxyethyl acrylate, methyl acrylate, methyl methacrylate, ethyl acrylate,ethyl methacrylate, butyl acrylate, butyl methacrylate, isobutylacrylate, isobutyl methacrylate, ethylhexyl acrylate, 2-ethylhexylmethacrylate, 2-ethyl hexyl acrylate, isoprene, octyl acrylate, octylmethacrylate, iso-octyl acrylate, iso-octyl methacrylate,trimethyolpropyl triacrylate, styrene, α-methyl, glycidyl methacrylate,carbodiimide methacrylate, C₁-C₁₈ alkyl crotonates, di-n-butyl maleate,α-or-β-vinyl naphthalene, di-octylmaleate, allyl methacrylate, di-allylmaleate, di-allylmalonate, methyoxybutenyl methacrylate, isobornylmethacrylate, hydroxybutenyl methacrylate, hydroxyethyl(meth)acrylate,hydroxypropyl(meth)acrylate, vinyl acetate, vinyl ethylene carbonate,epoxy butene, 3,4-dihydroxybutene, hydroxyethyl(meth)acrylate,methacrylamide, acrylamide, butyl acrylamide, ethyl acrylamide,vinyl(meth)acrylates, or isopropenyl(meth)acrylate. In particular,suitable latexes may include one or more of: styrene butadiene (SBR),polyvinyl acetate, polyvinyl acetate-acrylate, ethylene vinyl acetate,styrene acrylates, polyacrylates and acrylic materials. Still further,naturally derived binders may be used in the present invention. Suchbinders may include, but are not limited to, soy or animal proteinmaterials.

[0066] One of ordinary skill in the art will recognize that such bindersmay be useful in the methods of the present invention to assist inholding the colorant particles together and to the packaging substrate.The type of binder utilized in the methods of the present invention mayvary depending on the particular colorant utilized, the packagingsubstrate and the intended end use for the packaging material. Forexample, SBR binders typically provide very good binding strength,gloss, ink holdout, and flexibility. PVAc binders can provide goodgluing properties, brightness stability, ink receptivity, and low odor.Protein binders may contribute to appearance, gloss, fountain solutionacceptance, and glueability.

[0067] As for binder amounts to be included in the solutions, a bindermay be present in the dark and/or light colorant-containing solutions inan amount of from about 17 to about 60% by weight of each individualcolorant-containing solution. Still further, the binder may be presentin the dark and/or light colorant-containing solutions in an amount offrom about 17 to about 37% by weight of each individualcolorant-containing solution. Still further, the amount of binder may befrom 23% to 40% by weight of each individual colorant-containingsolution. In a further aspect, the binders may be present at from about25% to about 35% by weight of each individual colorant-containingsolution. Still further, the binders may be present in the individualcolorant-containing solutions in the amount of from about 20, 25, 30,35, 40, 45, 50, 55, 60, 65 or 70% by weight of each individualcolorant-containing solution, where any of these values may form thelower endpoint and the upper endpoint and any lower value may beutilized with any upper value. In a further aspect, the amount of binderis greater than 17% by weight. One of ordinary skill in the art willrecognize that such binder materials are often supplied as % solids inliquid. The values recited herein are measure as total dry weight undersolids used in the coating compositions.

[0068] In further aspects, a mixture of synthetically and naturallyderived binders may be utilized in the individual colorant containingsolutions. In one non-limiting aspect of the invention, the individualcolorant containing solutions may comprise a mixture of latex polymerbinder and animal and/or vegetable protein, wherein the total amount ofbinder in the acting composition is measured by the sum of the weightpercent of latex polymer solids and the soy protein solids. In a furtheraspect, the ratio of latex polymer to animal and/or vegetable protein isfrom about 2:1 to about 20:1, or from about 2:1 to about 10:1, where thetotal amount of binder in the individual colorant containing solutionsis as stated previously. Still further, the ratio of latex polymer toanimal and/or vegetable protein is from about 7:1 to about 12:1, wherethe total amount of binder in the individual colorant-containingsolutions is stated previously. Yet still further, the ratio of latexpolymer to animal and/or vegetable protein is from about 3:1, 5:1, 7:1,9:1, 10:1, 11:1, 13:1, 15:1, 17:1, 19:1, where any lower value may bepaired with any upper value and where the total amount of binder in theindividual colorant-containing solutions is as stated previously.

[0069] In one aspect, the dark colored layer does not comprise binderand the light colored layer comprises binder. In a further aspect, thedark colored layer comprises binder and the light colored layer does notcomprise binder. Still further, in another aspect, each of the coloredlayers comprise binder.

[0070] Although the amounts of components in the individual colorantsolutions are recited above, it should be noted that the amount ofpigment, binder and/or other ingredients, will be, in part, affected byfactors such as the base color of the substrate and the amount andduration of the grease masking needed in a particular application. Forexample, where recycled paperboard or SUS board stock is utilized as asubstrate, the base color of the substrate will be darker (or lesswhite). Accordingly, the amount of pigment in the light colored layer(s)may need to be higher in order to satisfactorily hide the color of thesubstrate. In contrast, if SBS is utilized as the substrate, the amountof light colored pigment needed in the light colored layer(s) may belower than that needed for a darker colored substrate because thissubstrate is less dark in color.

[0071] Moreover, while the specific type of binder(s) utilized in thepresent invention has not been found to be crucial to the presentinvention, one of ordinary skill in the art would recognize that theamount of pigment in the colorant containing solutions should directlyaffect the amount of binder to be included in the solutions. Thus, wherea lower amount of light colored pigment is utilized (as discussedabove), a proportionally lower amount of binder will be necessary.However, in accordance with the grease, fat or oil masking compositionsand methods of the present invention, the amount of binder needed for aparticular application has been found to be in excess of the amount ofbinder utilized for that same particular application where no grease,fat or oil masking properties are present.

[0072] The dark and light colored layers may be applied utilizingexisting methods of applying coatings to packaging substrates. Suchmethods and compositions useful herein are known generally to one ofordinary skill in the art of packaging material manufacture and, assuch, are not described in detail herein. Methods and compositions thatmay be utilized according to the invention herein are disclosed in U.S.Pat. Nos. 3,196,038, 3,873,345, 4,265,969 and 4,301,210, the disclosuresof which are each incorporated herein in their entireties by thisreference.

[0073] Further specific examples of coating methods that may be utilizedinclude the following.

[0074] In a major aspect, an in-line coating method maybe utilized toreduce the cost of the coating process, however, in another aspect anoff-line process may be utilized. Coating processes that may be utilizedinclude, but are not limited to: roll coating, rigid blade, straightblade or bent blade, air knife or a combination of coaters.Additionally, the compositions of the invention may be applied utilizingrotogravure and flexographic methods.

[0075] Roll coaters will generally not be utilized as a stand-alonecoating method but may be used as the applicator roll in each of thecoating processes discussed below. One of ordinary skill in the art willrecognize that roll coaters operate similarly to a roller one uses topaint a wall at home. That is, in one aspect, the roll may rotate in avat of coating and continues to rotate until it comes into contact withthe paperboard and applies the wet coating thereto. The wet coating maythen immediately be removed by either a blade, rod, or air knife.

[0076] A blade coater may be utilized to remove excess coating by use ofa rigid (straight) or bent blade. In either aspect, the blade mayactually contact the paperboard and scrape off the excess coating. Bladecoaters will generally leave more coating in the low areas (valleys) andless coating on the high areas (hills) of the paperboard.

[0077] Blade coatings may be utilized to level off and seal thepaperboard. Blade coatings generally augment paperboard smoothness andmay be preferable for some end uses. A typical blade coater willgenerally apply from about 1 to 2 dry pounds of coating per 1000 squarefeet. Blade coaters are generally utilized to apply base coating(primers) as well as top coatings to seal the sheet. Blade coaters areparticularly useful when the packaging substrate utilized herein is SBS.

[0078] A rod coater may be utilized according to the invention herein toremove excess coating with a smooth or wire wound rod. The rod may beplaced in a holder and may be slowly rotated as coating is wiped away.One of ordinary skill in the art will recognize that a rod coateroperates similarly to a blade coater in that it generally levels andseals the sheet, but may also follow the natural contour of thepaperboard surface. Rod coaters can be considered to allow a greatermargin for error than a blade coater, in that small impurities that cancause scratches and streaks in the blade process are more likely to passunder the rod and not cause these defects. For this reason, rod coaterswill be useful in the present invention when the packaging substratecomprises recycled paperboard and or SUS. Rod coaters will generallyapply from about 1 to 3 dry pounds of coating per 1000 square feet.

[0079] In a further aspect, an air knife coater may be utilized toremove excess dark and/or light colored layer by the blowing of athinjet of air on the wet coating. The air knife generally leaves a moreuniform film thickness of coating across the entire web by following thecontour of the sheet. Thus, if the surface of the packaging substrate isrough, it will remain rough. If it is smooth, it will generally remainsmooth. Because of its excellent uniformity and its greater thickness,air knife coatings may be utilized when an opaque coating is desired.Air knife coatings are particularly useful for coating SBS and recycledpaperboard. Typical air knife coaters will generally apply about 2 toabout 6 dry pounds of coating per 1000 square feet.

[0080] In accordance with the methods herein, two, three or more coatingunits may be utilized to prepare the packaging material. In one aspect,the use of multiple coating methods may allow improved smoothness of thesurface of the packaging material and may generally allow improvedprintability. One of ordinary skill in the art will recognize thatvarious combinations may be utilized depending on the characteristics ofthe packaging substrate and the performance and cost attributes desiredin the finished packaging material.

[0081] It will be recognized that when applied from acolorant-containing solution, the one or more colored layers are appliedwet and should normally be dried. Drying of the packaging materials canbe accomplished using either forced air or infrared dryers. In somecases both methods may be used.

[0082] In a further aspect, the coated packaging material may be drycalendered either before or after the application of a printed layer, ifone is desired. One of ordinary skill in the art will recognize that drycalendering is a process of polishing the coated substrate and ofcontrolling caliper and density of the finished surface. Calenderfinishing is generally performed to improve smoothness and increasegloss of the finished packaging material. In accordance with the presentinvention, a stack of calendar rolls may be utilized; this is generallyreferred to as “hard nip calendering.” Alternatively, gloss calendershaving a highly-polished, heated cylinder that is loaded against aresilient rubber backing roll may be utilized. As the packagingsubstrate outer surface comes into contact with the polished hot rolland enters the calender nip (between the two rolls), a slight change inspeed may occur which results in a polishing of the coating. Thisprocess is referred to as “soft nip calendering.” Methods of calenderingare known generally to those of ordinary skill in the art. Non-exclusiveexamples of calendering are disclosed in U.S. Pat. No. 5,029,521, thedisclosure of which is incorporated herein in its entirety by thisreference.

[0083] In a further major aspect of the invention herein, the darkcolored layer and light colored layer each, independently, may compriseone or more of: polyethylene, polyester, polypropylene, polystyrene, orhalogenated or non-halogenated vinyl polymers. Such materials may alsobe considered, in some aspects, to comprise binder materials. Withrespect to the polyethylene aspect, suitable polyethylenes include HDPE,MDPE, LDPE, LLDPE, homogenously branched linear ethylene polymers andsubstantially linear ethylene polymers. Such materials may also beconsidered, in some aspects, to comprise binder materials. In thisaspect, the dark colored layer and the light colored layer each,independently, may comprise from about 5 to about 40% colorant asmeasured by total weight of each individual layer. Still further, thedark colored layer and the second layer each, independently, may fromabout 5, 10, 15, 20, 30, 40, 45, and 50% colorant, where any of thesenumbers may comprise either endpoint for the amount of colorant and anylower endpoint may be utilized with any upper endpoint. While any of theabove-described colorants may be utilized in this aspect of theinvention, in one further particular aspect, the light colorant maycomprise titanium dioxide and the dark colorant may comprise carbonblack.

[0084] In this aspect of the invention, a grease, fat or oil permeablesubstrate having an outer surface is provided whereby a dark coloredlayer may be extruded onto the outer surface of the substrate and alight colored layer may be simultaneously or sequentially extruded ontoan outer surface of the dark colored layer. Alternatively, a paperboardmaterial may be utilized wherein one or more layers (plys) of thepaperboard are colored with a dark colorant. In this latter aspect, aone or more colored layers may be extruded onto the outer surface of thecolored paperboard with or without application of a precoat layer.

[0085] Methods of extrusion coating packaging materials are knowngenerally to one of ordinary skill in the art, and, as such, need not bedescribed in detail herein. Non-exclusive examples of extrusion coatingmethods that may be utilized according to the invention herein aredescribed generally in U.S. Pat. Nos. 4,343,858 and 4,455,184, thedisclosures of which are each incorporated herein in their entireties bythis reference.

[0086] In a further aspect, one or more of the colored layers may beextruded either simultaneously or sequentially to form a laminatematerial. This laminate material may be applied to the outer surface ofthe substrate of the invention herein to form either or both of thecolored layers.

[0087] In still a further aspect, a dark colored layer may be applied tothe substrate and a light color layer may be extruded to the darkcolored surface. For example, a dark colored layer having an inner andan outer surface may be applied from a dark colorant-containing solutionas set forth above. A light colored layer having an inner and an outersurface may then be extruded thereto. Alternatively, a dark coloredpaper or fabric may be applied to a paperboard, paper or fabricsubstrate and a light colored layer extruded thereto.

[0088] The substrates treated according to the present invention may beutilized in a number of different applications. In specific non-limitingexamples, packaging materials in the form of a box, cup, tray, plate,can, tube, bottle or other container form may be prepared. Materialspackaged therein may be consumer goods. In separate examples, thepackaging materials may be used for both food and non-food packaging. Asexamples of food that may suitably be packaged in materials treated withthe compositions and methods of the present invention, the followingnon-limiting examples are presented: sweets, chocolate, confectionery,pastries, biscuits, dairy products (e.g, butter and cheese), powderyfoodstuffs (e.g., coffee, tea, cocoa, flour, cereals), frozen food(e.g., ice cream, pastries, vegetables, seafood), fresh andsemipreserved foods, pet food or carryout foods. Non-limiting examplesof non-food packaging that may suitably be packaged in materials treatedwith the compositions and methods of the present invention include:cosmetics, toiletries, pharmaceuticals, cigarettes, detergents,textiles, toys, games, tools, household appliances, pesticides,fertilizers, hobby items, paper products, cassettes, record sleeves, andauto parts.

[0089] Converting methods known generally in the art may be utilized toform the packaging materials of the present invention. For example, thepackaging material may be fabricated into a box configuration, a tube(shell) configuration, a tray configuration, or a bottle wrapconfiguration. These recited examples are meant to be illustrative onlyand one of ordinary skill in the art would recognize that the types ofpackaging materials that may be fabricated utilizing the grease, fat oroil masking compositions of the present invention may encompass a widevariety of configurations. Moreover, one of ordinary skill in the artwould recognize conventional converting methods (i.e., cutting,creasing, and gluing) are suitable for use in conjunction with thepresent invention.

[0090] Experimental

[0091] The following examples are put forth so as to provide those ofordinary skill in the art with a complete disclosure and description ofhow the compounds, compositions, articles, devices, and/or methodsclaimed herein are made and evaluated, and are intended to be purelyexemplary of the invention and are not intended to limit the scope ofwhat the inventors regard as their invention. Efforts have been made toensure accuracy with respect to numbers (e.g., amounts, temperature,etc.) but some errors and deviations should be accounted for. Unlessindicated otherwise, parts are parts by weight, temperature is in ° F.or is at ambient temperature, and pressure is at or near atmospheric.

[0092] Bending chip recycled paperboard (“uncoated box board”) wasutilized in the examples.

[0093] Suitable formulations for use in the present invention are setforth in Tables 1 and 2 below.

[0094] Various grease, fat or oil-containing packaged goods were testedin packaging materials treated with formulations of the presentinvention, such as those described below. Such tests were run forextended times and at elevated temperatures as described.

[0095] All tests utilized grease, fat or oil-containing materials. Whereknown, test results set forth below include the weight percent ofgrease, fat or oil in the subject materials. However, since some testedproduct were proprietary formulations, the amount of grease, fat or oilwithin the product was unknown. In such cases, grease, fat or oils thatmay be present in the tested product are described. TABLE 1 Air CoatingMethod Material Supplier Product Name % solids wet lbs dry lbs pigmentsPigment Kaoline clay Theile Kaolin Company KaoPrint 0.68 15 10.2 47.6%68.8% TiO2 Trioxide Americas, Inc. RR-BC slurry 0.75 15 11.25 52.4%Protein Protein Technologies Pro-Code 427 0.15 8 1.2 3.8% Protein %Latex Rohm & Haas Res 3083 0.5 17 8.5 27.3% latex % Defoamer NalcoChemical Company Nalco 8669 0.76 0.038 0.029 0.09% Water 0 5 0 60.0431.18 31.1% Total % comb Binder calc. Solids 52% 39.6 Parts latex 5.6Parts protein 45.2 Parts binder

[0096] TABLE 2 Rod Coating Method Material Supplier Product name %solids wet lbs dry lbs dry pigments Pigment Kaoline clay #1 TheileKaolin Company Kaobrite 0.68 15 10.2 45.8% 68.9% Kaoline clay #2 TheileKaolin Company KaoPrint 0.68 15 10.2 45.8% TiO2 Trioxide Americas, Inc.RR-BC slurry 0.75 2.3 1.73 7.8% Black Various FDA listed pigment 0.80.16 0.13 0.6% Latex Rohm & Haas Res 3083 0.5 20 10 31.0% Defoamer NalcoChemical Company Nalco 8669 0.76 0.02 0.015 0.05% Thickener AlcoChemical Alcogum 149 0.354 0.078 0.028 0.09% Water 0 5 0 calc. Solids56.1% 44.9 Parts bunder

[0097] TABLE 3 COATING FORMULATIONS TESTED Coating Coating CoatingCoating Coating Coating Formula Formula Formula Formula Formula Formula#1 #1A #1C #1D #2A #2B First Down (White/light) Top Coating(s) PigmentsKaolin Clay 1 28.7% 35.2% 35.2% 35.2% 35.2% 35.2% Kaolin Clay 2  0.0% 0.0%  0.0%  0.0%  0.0%  0.0% TiO2 71.3% 29.1% 29.1% 29.1% 29.1% 29.1%Total Pigment % 63.0% 64.3% 64.3% 64.3% 64.3% 64.3% Binders Soy Protein 2.5%  0.0%  0.0%  0.0%  0.0%  0.0% Poly vinyl acetate 34.1% 35.6% 35.6%35.6% 35.6% 35.6% latex Total % comb. 36.6% 35.6% 35.6% 35.6% 35.6%35.6% Binder Additives Thickener  0.07%  0.0%  0.0%  0.0%  0.0%  0.0%Alcosperse  0.1%  0.0%  0.0%  0.0%  0.0%  0.0% Defoamer  0.25%  0.0% 0.0%  0.0%  0.0%  0.0% First down (dark) coating Starch Cationic  5%  0 0  0  0  0 Black Pigment  0.6%  0.1%  0.2%  0.2%  0.51%  0.51% Water94.40%  0.0  0  0  0  0 Pigments Kaolin Clay 1  0%  0.0%  0.0%  0.0% 0.0%  0.0% Kaolin Clay 2  0% 64.6% 64.6% 57.0% 60.3% 60.3% TiO₂  0% 0.0%  0.0% 11.1%  6.4%  6.4% Total Pigment %  0% 64.6% 64.6% 68.1%66.6% 66.6% Binders Soy Protein  0  0.0  0.0  0.0  0.0  0.0 Poly vinylacetate  0.0 35.3% 35.2% 31.7% 32.8% 32.8% Latex Total % comb.  0% 35.3%35.2% 31.7% 32.8% 32.8% Binder Additives  0  0  0  0  0  0 Thickener  0 0  0  0  0  0 Dispersant  0  0  0  0  0  0 Defoamer  0  0  0  0  0  0Coating Coating Coating Coating Coating Coating Formula Formula FormulaFormula Formula Formula #2C #5 #6 #7 #7-4B #8 First Down (White/light)Top Coating(s) Pigments Kaolin Clay 1 35.2% 35.2% 17.6% 44.90% 44.9%44.9% Kaolin Clay 2  0.0%  0.0%  0.0% TiO2 29.1% 29.1% 46.6% 18.1% 18.1%18.1% Total Pigment 64.3% 64.3% 64.2% 63.0% 63.0% 63.0% % Binders SoyProtein  2.0%  2.9%  0.0%  2.5%  2.5%  2.5% Poly vinyl 33.0% 31.0% 35.6%34.1% 34.1% 34.1% acetate laytex Total % 35.0% 33.9% 35.6% 36.6% 36.6%36.6% comb. binder Additives Thickener  0.0%  0.31%  0.065%  0.07% 0.07%  0.07% Dispersant  0.0%  0.16%  0.12%  0.10%  0.10%  0.10%Defoamer  0.0%  0.04%  0.007%  0.25%  0.25%  0.25% First down (dark)coating Starch Cationic  0  0  0  0  5%  5% Black Pigment  0.51%  0.15% 0.15%  0.2%  0.6%  0.6% Water  0  0.0  0.0  0.0 94.40% 94.40% PigmentsKaolin Clay 1  0.0% 31.0% 29.9% 30.2%  0%  0% Black Pigment  0.51% 0.15%  0.15%  0.2%  0.6%  0.6% Water  0  0.0  0.0  0.0 94.40% 94.40%Pigments Kaolin Clay 1  0.0% 31.0% 29.9% 30.2%  0%  0% Kaolin Clay 260.3% 31.0% 29.9% 30.2%  0%  0% TiO₂  6.4%  5.0%  5.1%  5.1%  0%  0%Total Pigment 66.6% 67.0% 64.9% 65.5%  0%  0% % Binders Soy Protein  0.0 0.0  0.0  0  0 Poly vinyl 32.8% 32% 35% 34%  0.0  0.0 acetate LatexTotal % 32.8% 32.0% 35.2% 34.0%  0%  0% comb. Binder Additives  0  0  0Thickener  0  0.31%  0.15%  0.21%  0  0 Dispersant  0  0.16%  0.10% 0.00%  0  0 Defoamer  0  0.04%  0.15%  0.04%  0  0

[0098] TABLE 4 Masking of Packaging Material Contacted with VotiveCandles or Oil Impregnated Dusting Gloves Oil impregnated Dusting GloveSubstrate Votive Candles* (˜5% mineral oil) Coating Formula 1 Good - Nooutside Stack test staining and very little Stored at 120 deg F. insidestaining Evaluated at 31 days Coating Formula 1 Good - No outsidestaining; Carton test very little to no inside Stored at 120 deg F.staining Evaluated at 117 days Coating Formula 1 Good - No outsidestaining; Carton test very little to no inside Stored at TAPPIconditions staining (73 deg. F., 50% humidity) Evaluated at 117 days

[0099] TABLE 5 Masking of Packaging Materials Contacted with Various CatFood Formulations Cat Food Formula I Cat Food Formula II Substrate (≧10% Fat Content) (≧ 14% Fat Content) Coating Formula 1 Good - No outsidestaining; Good - No outside staining; Hand filled Carton test Moderateinside staining; Moderate inside staining; Stored at 120 deg F. nostaining to corrugated no staining to corrugated Evaluated at 61 daysunder carton under carton Coating Formula #7-4B Good - No outsidestaining; Pile test Moderate inside staining Stored at 120 deg F.Evaluated at 117 days CCNB (comparative) Poor staining Poor stainingPile test Stored at 120 deg F. Evaluated at 21 days Low densityPolyethylene Poor - Inside edge wicking Poor - Inside edge wickingExtruded CCNB Paperboard Clear Inside Poly (½ mil inside) (comparative)Stored at 120 deg F. Evaluated at 21 days White Outside low densityPoor - Outside staining Poor - Outside staining Polyethylene extrusionvisible visible coated CCNB - (comparative) Stored at 120 deg F.Evaluated at 21 days White 2-sided low density Poor - Inside edgewicking Poor - Inside edge wicking Polyethylene extrusion coated CCNB(comparative) Stored at 120 deg F. Evaluated at 21 days MetalizedPolyester Film Good - Inside staining, no Good - Inside staining, nolaminated to CCNB outside staining outside staining (comparative) Storedat 120 deg F. Evaluated at 21 days Coating Formula #1A, 1C, Good -Slight inside Good - Slight inside stain; 1D Stored at 120 deg F.staining, no outside staining shiny area on outside where Evaluated at21 days product was piled (not a stain appearance) PM Good - Inside edgeGood - Inside edge Stored at 120 deg F. wicking, no outside stainingwicking, no outside staining Evaluated at 21 days

[0100] TABLE 6 Masking of Packaging Materials Contacted with Various DogSnack Formulations Dog Dog Snacks Snacks Dog Dog Snacks Dog SnacksFormula Formula Snacks Formula 1 Formula II III IV Formula V (≧4% Fat(≧3% Fat (≧6% Fat (≧6% Fat (≧14% Fat Substrate content) content)content) content) content) Coating Good-No Formula 1 outside Machinefilled stains; Carton test moderate Stored at 120 inside deg F stainingEvaluated at 61 days RF2 Poor- (comparative) Moderate Machine filledstaining Carton Test seen on Stored at 120 printed deg F side; Evaluatedat 61 moderate days inside staining Coating Good-No Good-No Formula 1outside outside Hand filled staining; no staining; carton test stainingon moderate Stored at 120 corrugated inside deg F under staining; noEvaluated at 72 carton staining to days corrugated under carton RF2Poor- Poor- (comparative) Several Many oil Test stains on droplet Storedat 120 printed stains on deg F side; no printed Evaluated at 72 stainingto side; days corrugated moderate under inside carton staining, nostaining to corrugated under carton Coating Good-no Formula #7-4Boutside Pile test staining, Stored at 120 moderate deg F insideEvaluated at staining 117 days CCNB Good-No Good-No Marginal- Poor-¼″Poor- (comparative) inside or inside or No major stains in Staining allHand-filled outside outside staining, several over the cartons Storedstaining staining several areas of the outside of at 120 deg F smallspots carton the carton Evaluated at 21 of staining days Low densityGood-No Good-No Good-No Good-No Poor- Polyethylene edge edge edge edgeEdge Extruded (1/2 wicking or wicking or wicking or wicking or stainingmil inside) staining staining staining staining CCNB Paperboard(comparative) Pile Test Stored at 120 deg F Evaluated at 21 days CoatingGood-No Good-No Good-No Good-No Good-No Formula outside outside outsideoutside outside #1D staining staining staining staining staining Piletest Stored at 120 deg F Evaluated at 21 days PM Good-No Good-No Good-NoGood-No Good-No Pile Test outside outside outside outside outside Storedat 120 staining staining staining staining staining deg F Evaluated at21 days

[0101] TABLE 7 Masking of Packaging Materials Contacted with HandLotion* Lotion Product Lotion Drop Test Lotion Stack Storage Test (3Substrate (7 hours) Test (3 weeks) weeks) Coating Formula #8 Good - Nooutside Good - No Good - No outside Hand filled Carton staining outsidestaining staining Stored at 120 deg F. Coating Formula #7- Good - Nooutside Good - No 4B staining outside staining Stored at 120 deg F.Coating Formula #6 Good - No outside Good - No Stored at 120 deg F.staining outside staining Coating Formula #5 Good - No outside Good - NoStored at 120 deg F. staining outside staining Coating Formula Good - Nooutside Good - No #2A, 2B, 2C staining outside staining Stored at 120deg F. Coating Formula #1- Good - No outside Good - No 1A, 1B, 1Cstaining outside staining Stored at 120 deg F.

[0102] TABLE 8 Masking of Packaging Materials Contacted with Biscuit MixSubstrate Biscuit Mix (≧ 14% Fat Content) Coating Formula 1 Good - Nooutside staining; Light inside Hand filled carton test staining; nostaining to corrugated under Stored at 120 deg F. carton Evaluated at 72days RF1 (comparative) Good - No outside staining; no staining toMachine filled Carton test corrugated under carton Stored at 120 deg F.Evaluated at 72 days Coating Formula #7-4B Good - No outside staining,Light inside Pile Test staining Stored at 120 deg F. Evaluated at 117days CCNB (comparative) Poor staining Pile test Stored at 120 F.Evaluated at 26 days Low density Polyethylene Good - No staining or edgewicking Extruded CCNB Paperboard (½ mil inside) (comparative) Pile TestStored at 120 deg F. Evaluated at 26 days GM (comparative) Poor - Lightstaining through the board Pile test Stored at 120 deg F. Evaluated at26 days 2 sided White Low density Good - No staining or edge wickingPoly CCNB (comparative) Pile Test Stored at 120 deg F. Evaluated at 26days White outside Poly Poor - Significant staining (comparative) PileTest Stored at 120 deg F. Evaluated at 26 days

[0103] TABLE 9 Masking of Packaging Materials Contacted with LotionImpregnated Tissues* Lotion-containing Substrate Tissues Coating Formula1 Good - No outside Hand filled carton Test Stored at 120 F. stainingEvaluated at 72 days Coating Formula 1 Good - No outside Hand filledcarton Test Stored at staining TAPPI conditions (73 deg. F., 50%humidity) Evaluated at 72 days

[0104] TABLE 10 Masking of Packaging Materials Contacted with VariousCat Food Formulations Cat Formula III Cat Food Formula IV Substrate (≧14% Fat content) (≧ 12% Fat content) Coating Formula 1 Good - No outsidestaining; Carton test Stored at 120 F. moderate inside staining;Evaluated at 72 days moderate staining at one corner of carton tocorrugated under carton Coating Formula #7-4B Good - No outsidestaining; Piled test Stored at 120 F. moderate inside staining Evaluatedat 117 days CCNB (comparative) Poor - Inside and outside Poor - Insideand outside Piled Test Stored at 120 F. staining staining Evaluated at183 days Coating Formula #2C Good - No outside staining Good - Nooutside staining Piled test Stored at 120 F. Evaluated at 183 days

[0105] TABLE 11 Masking of Packaging Materials Contacted with VariousCat Food Formulations Cat Food Formula V (≧ 8% Fat Substrate Content)Coating Formula 1 Good - No outside staining; Heavy staining Carton testStored at 120 F/ on inside of carton; Heavy staining on Evaluated at 72days corrugated under the carton RF2 (comparative) Marginal - No insidestaining; slight Pile test Stored at 120 F. staining on printed side ofsample Evaluated at 117 days Coating Formula #7-4-B Good - No outsidestaining; Heavy staining Piled test Stored at 120 F. on inside ofpaperboard Evaluated at 117 days Low density Polyethylene Extruded CCNBPoor - Pin-holing staining on carton; heavy Paperboard (½ Mil inside)(comparative) edge wicking staining Hand-filled carton test Stored at120 F. Evaluated at 21 days Coating Formula #2A, 2B, 2C Good - Nooutside staining; Heavy staining Filled Carton test Stored at 120 F. onfiber side of paperboard; Staining on Evaluated at 36 days paperboardunder the sample Coating Formula #2A, 2B, 2C Good - No outside staining;Heavy staining Piled test Stored at 140 F. on fiber side of paperboardEvaluated at 14 days

[0106] TABLE 13 Masking of Packaging Materials Contacted with Gravy Mix,Pancake Mix and Biscuit Mix Biscuit Mix Pancake Mix II Gravy Mix (˜3%Fat (≧3% Fat Substrate (˜10% Fat Content) Content) Content) CoatingFormula #7-4B Good - No outside Pile Test Stored at 120 F. staining,Light inside Evaluated at 117 days staining Low density Good- Nostaining or edge Polyethylene Extruded wicking; CCNB Paperboard (½ Veryslight staining seen mil inside) after 4 months, however, (comparative)print graphics would likely Filled Carton Test cover the stain; Storedat 120 F. Staining at die cut edges Evaluated at 154 days and alongbottom fold is worsening in the 5^(th) month of storage CCNB(comparative) Good - No Filled Carton Test staining or Stored at 120 F.edge wicking Evaluated at 154 days CCNB (comparative) Poor- Majorstaining Good - No Good - No Pile Test staining or staining or Stored At120 Deg F. edge wicking edge wicking Evaluated at 24 days Low densityGood - No staining Good - No Good - No Polyethylene Extruded stainingstaining CCNB Paperboard (½ mil inside) (comparative) Pile Test Storedat 120 F. Evaluated at 28 days PM (comparative) Good - No staining tothe Good - No Good - No Pile Test print side staining staining Stored at120 F. Evaluated at 28 days

[0107] TABLE 14 Masking of Packaging Materials Contacted with SnackCrackers and Dog Biscuits Snack Crackers (˜16% Fat Dog BiscuitsSubstrate content) (˜6% fat Content) Coating Formula 1 Good - No outsideHand filled carton Test without inner liner staining, no inside Storedat 120 deg F. staining Evaluated at 22 days Coating Formula 1 Good - NoHand filled carton Test without inner liner outside staining, Stored at120 deg F. very slight Evaluated at 72 days staining to corrugated atcorners of carton Coating Formula 1 Good - No Hand filled carton Testwithout inner liner outside staining, Stored at 140 deg F. very slightEvaluated at 72 days staining to corrugated at corners of carton CoatingFormula 1 Good - No Hand filled carton Test without inner liner outsidestaining, Stored at TAPPI conditions (73 deg. F., 50% no staining tohumidity) corrugated under Evaluated at 72 days carton RF2 without innerliner (comparative) Good - No Stored at 120 F. outside staining,Evaluated at 72 days medium staining to corrugated at corners of cartonRF2 (comparative) Good - No Stored at 140 F. outside staining, Evaluatedat 72 days medium staining to corrugated at corners of carton RF2(comparative) Good - No TAPPI conditions (73 deg. F., 50% humidity)outside staining, Evaluated at 72 days no staining to corrugated undercarton Coating Formula #2A, 2B, 2C Good - No Pile Test Staining Storedat 140 deg. F. at 14 days

[0108] TABLE 15 Masking of Packaging Materials Contacted with VariousDryer Sheets* Dryer Dryer Sheet Dryer Sheet Substrate Sheet I II DryerSheet III IV Coating Formula 1 Good - Good - No Good - No Good - NoHand-filled Carton test No outside outside staining outside Stored at120 F. outside staining staining Evaluated at 4 days staining CoatingFormula 1 Good - Good - No Good - No Good - No Hand-filled Carton testNo outside outside staining outside Stored at 100 F./70% outsidestaining staining RH staining Evaluated at 4 days Coating Formula 1Good - Good - No Good - No Good - No Hand-filled Carton test No outsideoutside staining outside 80 deg F./80% RH outside staining stainingEvaluated at 4 days staining Coating Formula 1 Good - Good - No Good -No Good - No Hand-filled Carton test No outside outside staining outsideStored at TAPPI outside staining staining conditions (73 deg. F.,staining 50% humidity) Evaluated at 4 days Low density Good - Poor -Major Marginal - Good - No Polyethylene Extruded No outside Slightoutside outside (½ mil inside) CCNB outside staining staining aroundstaining Paperboard staining around die cut perforations (comparative)perforations Hand-filled carton test Stored at 120 F. Evaluated at 4days Low density Good - Good - No Good - No Good - No PolyethyleneExtruded No outside outside staining outside (½ mil inside) CCNB outsidestaining staining Paperboard staining (comparative) Hand-filled cartontest Stored at 100 F./70% RH Evaluated at 4 days Low density Good -Good - No Good - No Good - No Polyethylene Extruded No outside outsidestaining outside (½ mil inside) CCNB outside staining stainingPaperboard staining (comparative) Hand-filled carton test Stored at 80deg F./ 80% RH Evaluated at 4 days Low density Good - Good - No Good -No Good - No Polyethylene Extruded No outside outside staining outside(½ mil inside) CCNB outside staining staining Paperboard staining(comparative) Hand-filled carton test Stored at TAPPI conditions (73deg. F., 50% humidity) Evaluated at 4 days Coating Formula 1 Good -Poor - Heavy Good - No Good - No Stack test - Stored at No tack on printstaining to print staining to 120 F. staining to print stack side;slight tack print side; Evaluated at 7 days to print test* on print toprint slight tack on side; slight stack test print to print tack onprint stack test to print stack test

[0109] As set forth in the various Tables above, the substrates treatedaccording to the methods and compositions and methods of the presentinvention effectively mask staining from grease, fat or oil permeationthrough a packaging material. Further, the appearance of the packagingmaterial is equal to or better than packaging materials treatedaccording to prior art methods and compositions including the nowunavailable flurochemical barrier treatments. Accordingly, these resultsdemonstrate that the methods and compositions of the present inventionprovide a useful and valuable improvement to the field of packagingmaterials.

[0110] Throughout this application, various publications are referenced.The disclosures of these publications in their entireties are herebyincorporated by reference into this application in order to more fullydescribe the state of the art to which this invention pertains.

[0111] It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the scope or spirit of the invention. Otherembodiments of the invention will be apparent to those skilled in theart from consideration of the specification and practice of theinvention disclosed herein. It is intended that the specification andexamples be considered as exemplary only, with a true scope and spiritof the invention being indicated by the following claims.

What is claimed is:
 1. A material for packaging grease, fat oroil-containing substances, wherein the material comprises: a. a grease,fat or oil permeable substrate suitable for use as a packaging material,wherein the substrate has an inner and an outer surface; b. a darkcolored layer comprising a dark colorant and having an inner and anouter surface, wherein the dark colored layer is optionally applied froma solution comprising a dark colorant, and wherein the inner surface ofthe dark colored layer is disposed proximal to the outer surface of thesubstrate; and c. a light colored layer having an inner and an outersurface, wherein the light colored layer is applied from a solutioncomprising a light colorant, and wherein the inner surface of the lightcolored layer is disposed proximal to the outer surface of the darkcolored layer; wherein one or more of the light colored or darkcolorant-containing solutions each, independently, comprises a bindermaterial at from about 17% to about 60% by weight of the respectivecolorant-containing solution, wherein the dark and light colored layersare selected to mask an appearance of grease, fat or oil staining on thepackaging material, and wherein neither the dark colored layer nor thelight colored layer comprises a non-leafing metallic ink.
 2. Thepackaging material of claim 1, wherein the inner surface of the lightcolored layer is adjacent to the outer surface of the dark coloredlayer.
 3. The packaging material of claim 1, wherein the inner surfaceof the dark colored layer is adjacent to the outer surface of thesubstrate.
 4. The packaging material of claim 1, wherein the darkcolorant comprises one or more of: carbon black, raw sienna, burntsienna, burnt umber, chrome black, high purity furnace black, black azodyes or brown azo dyes.
 5. The packaging material of claim 1, whereinthe dark colorant comprises carbon black.
 6. The packaging material ofclaim 1, wherein the light colorant comprises one or more of: titaniumdioxide, calcium carbonate, calcium silicate, calcium sulfate, bariumsulfate, natural clay, synthetic clay, magnesium oxide, magnesiumsilicate, zinc carbonate, zinc oxide or plastic pigment.
 7. Thepackaging material of claim 1, wherein the light colorant comprisestitanium dioxide.
 8. The packaging material of claim 1, wherein the darkcolored layer is applied from the dark colorant-containing solution andthe solution comprises from about 0.01 to about 20.0% by weight of thedark colorant as measured by total weight of the solution.
 9. Thepackaging material of claim 1, wherein the dark colored layer is appliedfrom the dark colorant-containing solution and the solution comprisesfrom about 0.25 to about 4.0% by weight of the dark colorant as measuredby total weight of the solution.
 10. The packaging material of claim 1,wherein the light colorant-containing solution comprises from about 30to about 90% by weight of the light colorant as measured by total weightof the solution.
 11. The packaging material of claim 1, wherein thelight colorant-containing solution comprises from about 40 to about 80%by weight of the light colorant as measured by total weight of thesolution.
 12. The packaging material of claim 1, wherein the substratecomprises one or more dark colored outer plys, thereby providing thedark colored layer on the outer surface of the substrate.
 13. Thepackaging material of claim 1 having a TAPPI brightness number of fromabout 60 to about
 90. 14. The packaging material of claim 1, wherein thedark colored layer is applied from the dark colorant-containing solutionand the solution further comprises a sizing agent, dark colored pigmentand water.
 15. The packaging material of claim 14, wherein the sizingagent comprises starch.
 16. The packaging material of claim 1, whereinthe grease, fat or oil permeable substrate comprises paperboard, paperor fabric.
 17. The packaging material of claim 1, wherein the grease,fat or oil permeable substrate comprises paperboard.
 18. The packagingmaterial of claim 17, wherein the paperboard comprises one or more of:SBS, SUS or recycled paperboard.
 19. The packaging material of claim 1,wherein the packaging material is suitable for use in packaging of humanfood, animal food, drugs or cosmetics.
 20. The packaging material ofclaim 1, wherein one or more of the dark or the lightcolorant-containing solutions each, independently, further comprise oneor more of: water, dispersant, resin, surfactant, wetting agent,defoamer, thickener, starch, preservative or antioxidant.
 21. Thepackaging material of claim 1, wherein the binder is present at fromabout 20 to about 50% by weight of the light or dark colorant-containingsolutions.
 22. The packaging material of claim 1, wherein the bindercomprises one or more of a naturally or synthetically derived binder.23. The packaging material of claim 1, wherein the binder comprises alatex polymer and a protein.
 24. The packaging material of claim 23,wherein the ratio of latex polymer to protein is from about 2:1 to about10:1.
 25. The packaging material of claim 1, further comprising aprinted layer adjacent to the outer surface of the light colored layer.26. An article prepared from the packaging material of claim
 1. 27. Thearticle of claim 26, wherein the article further comprises a consumergood.
 28. The article of claim 26 in the form of a wrap, pouch, bag,box, cup, tray, plate, can, tube or bottle.
 29. The article of claim 26,further comprising a food material comprising one or more of: sweets,chocolate, confectionery, pastries, biscuits, dairy products, powderyfoodstuffs, frozen food, fresh and semipreserved foods, pet food, orcarryout foods.
 30. The article of claim 26, further comprising anon-food material comprising one or more of: cosmetics, toiletries,pharmaceuticals, cigarettes, detergents, textiles, toys, games, tools,household appliances, pesticides, fertilizers, hobby items, paperproducts, cassettes, record sleeves, or auto parts.
 31. A material forpackaging grease, fat or oil-containing substances, wherein the materialcomprises: a. a grease, fat or oil permeable substrate suitable for useas a packaging material, wherein the substrate has an inner and an outersurface; b. a dark colored layer comprising a dark colorant and havingan inner and an outer surface, wherein the dark colored layer isoptionally applied from a composition comprising a dark colorant, andwherein the inner surface of the dark colored layer is disposed proximalto the outer surface of the substrate; and c. a light colored layerhaving an inner and an outer surface, wherein the light colored layer isapplied from a composition comprising a light colorant and one or moreof: polyethylene, polypropylene, polyester, polystyrene, or halogenatedor non-halogenated vinyl polymer, and wherein the inner surface of thelight colored layer is disposed proximal to the outer surface of thedark colored layer; wherein the dark and light colored layers areselected to mask an appearance of grease, fat or oil staining on thepackaging material, and wherein neither the dark colored layer nor thelight colored layer comprises a non-leafing metallic ink.
 32. Thepackaging material of claim 31, wherein the dark colored layer isapplied from the dark colorant-containing composition and the dark andlight colored compositions each, independently, comprise from about 5 toabout 40% colorant as measured by the total weight of each coloredcomposition.
 33. The packaging material of claim 31, wherein the darkcolored layer is applied from the dark colorant-containing compositionand the composition comprises one or more of: polyethylene,polypropylene, polyester, polystyrene, or halogenated or non-halogenatedvinyl polymer.
 34. An article prepared from the packaging material ofclaim
 31. 35. The article of claim 34 in the form of a wrap, pouch, bag,box, cup, tray, plate, can, tube or bottle.
 36. The article of claim 34further comprising a consumer good.
 37. The article of claim 34 furthercomprising a food material comprising one or more of: sweets, chocolate,confectionery, pastries, biscuits, dairy products, powdery foodstuffs,frozen food, fresh and semipreserved foods, pet food, or carryout foods.38. The article of claim 34 further comprising a non-food materialcomprising one or more of: cosmetics, toiletries, pharmaceuticals,cigarettes, detergents, textiles, toys, games, tools, householdappliances, pesticides, fertilizers, hobby items, paper products,cassettes, record sleeves, or auto parts.
 39. A material for packaginggrease, fat or oil-containing substances, wherein the materialcomprises: a. a grease, fat or oil permeable substrate suitable for useas a packaging material, wherein the substrate has an inner and an outersurface; b. a dark colored layer comprising a dark colorant and havingan inner and an outer surface, wherein the dark colored layer isoptionally applied from a solution comprising a dark colorant, andwherein the inner surface of the dark colored layer is disposed proximalto the outer surface of the substrate; and c. a light colored layerhaving an inner and an outer surface, wherein the light colored layer isapplied from a solution comprising a light colorant, and wherein theinner surface of the light colored layer is disposed proximal to theouter surface of the dark colored layer; wherein one or more of thelight colored or dark colorant-containing solutions each, independently,comprises a binder material at from about 17% to about 60% by weight ofthe respective colorant containing solution, wherein the dark and lightcolored layers are selected to mask an appearance of grease, fat or oilstaining on the packaging material, and wherein both the dark colorantand light colorant containing solutions are aqueous.
 40. The packagingmaterial of claim 39, wherein neither the dark colored layer nor thelight colored layer comprises a non-leafing metallic ink.
 41. Thepackaging material of claim 39, wherein the dark colored layer isapplied from the dark colorant-containing solution and the solutioncomprises a sizing agent, dark colored pigment and water.
 42. Thepackaging material of claim 39, wherein the sizing agent comprisesstarch.
 43. The packaging material of claim 39, wherein the grease, fator oil permeable substrate comprises paperboard, paper or fabric. 44.The packaging material of claim 43, wherein the substrate comprisespaperboard comprising one or more of: SBS, SUS or recycled paperboard.45. The packaging material of claim 39, wherein the packaging materialis suitable for use in packaging human food, animal food, drugs orcosmetics.
 46. The packaging material of claim 39, wherein the bindercomprises one or more of: a naturally or a synthetically derived binder.47. The packaging material of claim 39, wherein the binder comprises alatex polymer and a protein.
 48. The packaging material of claim 47,wherein the ratio of latex polymer to protein is from about 2:1 to about10:1.
 49. An article prepared from the packaging material of claim 39.50. The article of claim 49, in the form of a wrap, pouch, bag, box,cup, tray, plate, can, tube or bottle.
 51. The article of claim 49further comprising a consumer good.
 52. The article of claim 49 furthercomprising a food material comprising one or more of: sweets, chocolate,confectionery, pastries, biscuits, dairy products, powdery foodstuffs,frozen food, fresh and semipreserved foods, pet food, or carryout foods.53. The article of claim 49 further comprising a non-food materialcomprising one or more of: cosmetics, toiletries, pharmaceuticals,cigarettes, detergents, textiles, toys, games, tools, householdappliances, pesticides, fertilizers, hobby items, paper products,cassettes, record sleeves, or auto parts.
 54. A method of making apackaging material that masks grease, fat or oil permeation in a grease,fat or oil permeable packaging material comprising the steps of: a.providing a grease, fat or oil permeable substrate suitable for use as apackaging material, wherein the substrate has an inner and an outersurface; b. selecting a dark colored layer having an inner and an outersurface and a light colored layer having an inner and an outer surface,wherein the layers are together suitable for masking an appearance of agrease, fat or oil permeation on the packaging material; c. applying thedark colored layer proximal to the outer surface of the substrate,wherein the dark colored layer is optionally applied from a solutioncomprising a dark colorant; and d. applying the light colored layerproximal to the outer surface of the dark colored layer, wherein thelight colored layer is applied from a solution comprising a lightcolorant; wherein one or more of the dark or light colorant-containingsolutions each, independently, comprises a binder material at from about17% to about 60% by weight as measured by weight of the respectivesolution, and wherein neither the dark colored layer nor the lightcolored layer comprises a non-leafing metallic ink.
 55. The method ofclaim 54, wherein the inner surface of the dark colored layer isadjacent to the outer surface of the substrate.
 56. The method of claim54, wherein the inner surface of the light colored layer is adjacent tothe outer surface of the dark colored layer.
 57. The method of claim 54,wherein the dark colorant comprises one or more of: carbon black, rawsienna, burnt sienna, burnt umber, chrome black, high purity furnaceblack, black azo dyes or brown azo dyes.
 58. The method of claim 54,wherein the dark colorant comprises carbon black.
 59. The method ofclaim 54, wherein the light colorant comprises one or more of: titaniumdioxide, calcium carbonate, calcium silicate, calcium sulfate, bariumsulfate, natural clay, synthetic clay, magnesium oxide, magnesiumsilicate, zinc carbonate, zinc oxide or plastic pigment.
 60. The methodof claim 54, wherein the light colorant comprises titanium dioxide. 61.The method of claim 54, wherein the dark colored layer is applied fromthe dark colorant-containing solution and the solution comprises fromabout 0.01 to about 20.0% by weight of the dark colorant as measured bytotal weight of the solution.
 62. The method of claim 54, wherein thedark colored layer is applied from the dark colorant-containing solutionand the solution comprises from about 0.25 to about 4.0% by weight ofthe dark colorant as measured by total weight of the solution.
 63. Themethod of claim 54, wherein the light colorant-containing solutioncomprises from about 30 to about 90% by weight of the light colorant asmeasured by total weight of the solution.
 64. The method of claim 54,wherein the light colorant-containing solution comprises from about 40to about 80% by weight of the light colorant as measured by total weightof the solution.
 65. The method of claim 54 having a TAPPI brightnessnumber of from about 60 to about
 90. 66. The method of claim 54, whereinthe dark colored layer is applied from the dark colorant-containingsolution and the solution further comprises a sizing agent, dark coloredpigment and water.
 67. The method of claim 66, wherein the sizing agentcomprises starch.
 68. The method of claim 54, wherein the grease, fat oroil permeable substrate comprises paperboard, paper or fabric.
 69. Themethod of claim 54, wherein the grease, fat or oil permeable substratecomprises paperboard.
 70. The method of claim 69, wherein the paperboardcomprises one or more of: SBS, SUS or recycled paperboard.
 71. Themethod of claim 54, wherein the packaging material is suitable for usein packaging human food, animal food, drugs or cosmetics.
 72. The methodof claim 54 further comprising the step of forming the packagingmaterial into a wrap, pouch, bag, box, cup, tray, plate, can, tube orbottle, thereby forming an article.
 73. The method of claim 72, furthercomprising the step of including a packaged material in the article,wherein the packaged material comprises one or more of: sweets,chocolate, confectionery, pastries, biscuits, dairy products, powderyfoodstuffs, frozen food, fresh and semipreserved foods, pet food,carryout foods, cosmetics, toiletries, pharmaceuticals, cigarettes,detergents, textiles, toys, games, tools, household appliances,pesticides, fertilizer, hobby items, paper products, cassettes, recordsleeves, or auto parts.
 74. The method of claim 54, wherein one or moreof the dark colored layer and the light colored layers each,independently, comprises one or more of: water, dispersant, resin,surfactant, wetting agent, defoamer, thickener, starch, preservative orantioxidant.
 75. The method of claim 54, wherein the binder comprisesone or more of: a naturally or synthetically derived binder.
 76. Themethod of claim 54, wherein the binder comprises a latex polymer and aprotein.
 77. The method of claim 76, wherein the ratio of latex polymerto protein is from about 2:1 to about 10:1.
 78. The method of claim 54,further comprising applying a printed layer adjacent to the outersurface of the light colored layer.
 79. A method for masking grease, fator oil staining on a packaging material, wherein the method comprisesthe steps of: (a) contacting the packaging material of claim 54 with agrease, fat or oil containing material.
 80. A method of making apackaging material that masks grease and oil permeation in a grease, fator oil packaging material, comprising the steps of: a. providing agrease, fat or oil permeable substrate having an inner and an outersurface, wherein the substrate is suitable for use as a packagingmaterial; b. selecting a dark colored layer having an inner and an outersurface and a light colored layer having an inner and an outer surface,wherein the layers are together suitable for masking an appearance ofgrease, fat or oil permeation on the packaging material; c. extruding acomposition comprising a dark colorant proximal to the outer surface ofthe substrate, thereby providing the dark colored layer; and d.extruding, either simultaneously or sequentially to step (c), acomposition comprising a light colorant proximal to the outer surface ofthe dark colored layer, thereby providing the light colored layer. 81.The method of claim 80, wherein the dark colored layer and light coloredlayer each, independently, comprises one or more of: polyethylene,polypropylene, polyester, polystyrene or halogenated or non-halogenatedvinyl polymer.
 82. The method of claim 80, wherein the dark coloredlayer and the light colored layer each, independently, comprise fromabout 5 to about 40% colorant as measured by total weight of eachindividual layer.
 83. The method of claim 80, wherein the light coloredlayer comprises one or more of: titanium dioxide, calcium carbonate,calcium silicate, calcium sulfate, barium sulfate, natural clay, asynthetic clay, magnesium oxide, magnesium silicate, zinc carbonate orzinc oxide.
 84. The method of claim 80, wherein the light colored layercomprises titanium dioxide.
 85. The method of claim 80, wherein thesubstrate comprises paperboard comprising one or more of: SBS, SUS orrecycled paperboard.
 86. The method of claim 80, wherein the packagingmaterial is suitable for use in packaging human food, animal food, drugsand cosmetics.
 87. The method of claim 80 further comprising forming thepackaging material into a wrap, pouch, bag, box, cup, tray, plate, can,tube or bottle, thereby forming an article.
 88. The method of claim 87further comprising including a packaged material in the articlecomprising one or more of: sweets, chocolate, confectionery, pastries,biscuits, dairy products, powdery foodstuffs, frozen food, fresh andsemipreserved foods, pet food, carryout foods, cosmetics, toiletries,pharmaceuticals, cigarettes, detergents, textiles, toys, games, tools,pesticides, fertilizers, household appliances, hobby items, paperproducts, cassettes, record sleeves, or auto parts.
 89. A method formasking the appearance of grease, fat or oil staining on a packagingmaterial, wherein the method comprises: (a) contacting the packagingmaterial of claim 80, with a grease, fat or oil containing material. 90.A method for making a packaging material that masks grease, fat or oilpermeation in a grease, fat or oil permeable packaging material,comprising the steps of: a. providing a grease, fat or oil permeablesubstrate having an outer surface and a dark colored outer layer havingan inner and an outer surface, wherein the substrate is suitable for useas a packaging material; and b. extruding a composition comprising alight colorant proximal to the outer surface of the dark colored outerlayer, thereby providing a light colored outer layer, wherein the darkcolored layer and the light colored outer layer are selected so as tomask the appearance of grease, fat or oil staining on the packagingmaterial, thereby providing a packaging material suitable for maskingthe appearance of grease, fat or oil on the material.
 91. The method ofclaim 90, wherein the dark colored outer layer is obtained by extrudinga composition comprising a dark colorant proximal to the outer surfaceof the substrate prior to the extrusion step.
 92. The method of claim90, wherein the dark colored outer layer is obtained by applying asolution comprising a dark colorant to the outer surface of thesubstrate prior to the extrusion step.
 93. The method of claim 90,wherein the dark colored outer surface is obtained by placing a darkcolored paper or fabric layer on the outer surface of the substrateprior to the extrusion step.
 94. The method of claim 90, wherein thedark colored outer surface is obtained by including one or more darkcolored plys in the outer surface of the substrate prior to theextrusion step.
 95. A method for masking grease, fat or oil staining ona packaging material method, wherein the method comprises: a. contactingthe packaging material of claim 90 with a grease, fat or oil containingmaterial.
 96. A method for making a material for masking grease and oilpermeation in a grease, fat or oil permeable, substrate, comprising thesteps of: a. providing a grease, fat or oil permeable substrate havingan inner and an outer surface, wherein the substrate is suitable for useas a packaging material; b. selecting a dark colored layer and a lightcolored layer wherein the layers are together suitable for maskinggrease, fat or oil permeation in the substrate; c. extruding eithersimultaneously or sequentially a composition comprising a dark colorantand a composition comprising a light colorant, thereby forming alaminate material having an inner and an outer surface, wherein thelight colored layer forms the outer surface of the laminate material andthe dark colored layer forms the inner surface of the laminate material;d. applying the inner surface of the laminate material to the outersurface of the substrate, thereby providing a packaging materialsuitable for masking the appearance of grease, fat or oil on thematerial.
 97. A method for masking grease, fat or oil staining on apackaging material, wherein the method comprises: a. contacting thepackaging material of claim 96, with a grease, fat or oil containingmaterial.